:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-text: #1f2933;
    --color-heading: #1e2a38;
    --color-muted: #4b5b6b;
    --color-muted-2: #5b6875;
    --color-border: #d9e0e7;
    --color-border-soft: #c7d2de;
    --color-input-border: #cfd8e3;

    --color-label-bg: #eef2f6;
    --color-button-secondary: #e9eef3;

    --color-success-bg: #e7f4ea;
    --color-success-text: #1f6b3a;

    --color-warning-border: #ef9a9a;
    --color-warning-bg: #fff5f5;
    --color-warning-text: #b42318;

    /* 通知・アクセント系（アカウント機能で追加。値は据え置き、命名のみ整理） */
    --color-notice-text: #c2410c;       /* いいね数バッジ・未読オレンジ */
    --color-notice-bg: #fff7ed;
    --color-notice-bg-strong: #ffedd5;
    --color-notice-border: #fdba74;
    --color-alert: #dc2626;             /* ナビの未読バッジ（赤） */
    --color-fav-star: #f5a524;          /* お気に入り★ */
    --color-mydeck-accent: #6d28d9;     /* マイデッキ・バッジ（紫） */
    --color-mydeck-accent-bg: #ede9fe;

    /* 繰り返し使う淡い面色 */
    --color-surface-alt: #f8fafc;
    --color-highlight-bg: #f0f6ff;
    --color-study-green: #a8d9b0;

    /* サイト共通アクセントブルー。旧来ツールCSSに分散していた #2563aa / #4a90d9 / #3a7bd5
       等の派生青は本トークンへ統一する（weather_charts.css / notam.css 参照）。 */
    --color-accent: #1a6fc4;
    --color-accent-dark: #1d4d85;
    --color-loading: var(--color-accent);  /* ローディング表示（旧名称を維持、値はaccentに統一） */

    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 6px 14px rgba(0, 0, 0, 0.12);

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-pill: 999px;

    --container-width: 1100px;
    --article-width: 900px;
    --hero-width: 820px;
    --hero-text-width: 720px;
    --error-width: 600px;

    /* フォントはWebフォントを読み込まず、OSごとの日本語ゴシックへ委ねる
       （読み込みコストゼロを維持しつつ Arial 単独指定の文字化け的な素っ気なさを解消）。 */
    --font-sans: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
        "BIZ UDPGothic", "Yu Gothic Medium", "Yu Gothic", Meiryo, sans-serif;
    --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
}

/* キーボード操作時のみフォーカスリングを表示（マウス操作では変化なし）。
   これまでフォーカススタイルが無く、.fc-flip-card は outline:none で消していた。 */
:focus-visible {
    outline: 2px solid var(--color-heading);
    outline-offset: 2px;
}

/* スキップリンク：キーボード/スクリーンリーダー利用者がヘッダーナビを毎回
   読み上げずに本文へ飛べるようにする。フォーカスを受けるまで画面外に隠す。 */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 3000;
    padding: 10px 16px;
    background-color: var(--color-heading);
    color: #ffffff;
    border-radius: 0 0 var(--radius-md) 0;
    font-weight: bold;
    text-decoration: none;
}

.skip-link:focus {
    left: 0;
}

/* モーダル/スライドパネル表示中は背後のページスクロールを止める */
body.has-modal-open {
    overflow: hidden;
}

h1,
h2,
h3,
h4 {
    margin-top: 0;
}

/* Layout */
.site-header {
    color: #ffffff;
    background-color: var(--color-heading);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    /* PWA standalone起動時のノッチ/ステータスバー対策（通常のブラウザ表示では env() が
       未対応/0pxのため無影響）。フォールバック値を必ず付けること。 */
    padding-top: env(safe-area-inset-top, 0px);
}

.header-inner,
.site-main {
    max-width: var(--container-width);
    margin: 0 auto;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 16px calc(20px + env(safe-area-inset-right, 0px)) 16px calc(20px + env(safe-area-inset-left, 0px));
}

.site-main {
    padding: 24px 20px 40px;
}

/* Navigation */
.site-brand a,
.site-nav a {
    color: #ffffff;
    text-decoration: none;
}

.site-brand a {
    display: inline-flex;
    flex-direction: column;
    line-height: 1.2;
    font-size: 1.2rem;
    font-weight: bold;
}

.site-brand-sub {
    font-size: 0.7rem;
    font-weight: normal;
    opacity: 0.6;
    letter-spacing: 0.02em;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.site-nav a {
    padding: 8px 10px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.15s ease;
}

.site-nav a:hover {
    background-color: rgba(255, 255, 255, 0.12);
}

/* モバイルnavドロワー用の部品。デスクトップでは非表示（この基本ルールは
   下の @media ブロックより前に置くこと — 同一詳細度のため記述順で上書きする） */
.site-nav-toggle,
.site-nav-close,
.site-nav-overlay {
    display: none;
}

/* 769〜1024px（タブレット横向き等）: ドロワー化はまだ発生しないため、
   横並びの8項目ナビが窮屈にならないよう詰める。768px以下は次のブロックが上書きする。 */
@media (max-width: 1024px) {
    .site-nav {
        gap: 8px;
    }

    .site-nav a {
        padding: 8px 8px;
        font-size: 0.88rem;
    }
}

/* ≤768px: ナビを右スライドインのドロワーにする。
   デスクトップ(≥769px)には一切影響しないよう、全て @media 内に置く */
@media (max-width: 768px) {
    .header-inner {
        padding: 10px calc(16px + env(safe-area-inset-right, 0px)) 10px calc(16px + env(safe-area-inset-left, 0px));
        gap: 12px;
    }

    /* ☰ 開閉ボタン */
    .site-nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        position: relative;
        width: 44px;
        height: 44px;
        border: none;
        background: none;
        color: #ffffff;
        font-size: 1.5rem;
        line-height: 1;
        cursor: pointer;
        border-radius: var(--radius-sm);
    }

    /* ドロワーが閉じていてもお問い合わせ未読が分かる赤ドット */
    .nav-toggle-dot {
        position: absolute;
        top: 7px;
        right: 7px;
        width: 9px;
        height: 9px;
        border-radius: 50%;
        background: var(--color-alert);
    }

    /* 暗幕オーバーレイ */
    .site-nav-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 1001;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.25s ease;
    }
    .site-nav-overlay.is-open {
        opacity: 1;
        pointer-events: auto;
    }

    /* ナビ本体：右からのスライドインドロワー */
    .site-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(280px, 85vw);
        flex-direction: column;
        flex-wrap: nowrap;
        gap: 4px;
        padding: calc(60px + env(safe-area-inset-top, 0px)) calc(16px + env(safe-area-inset-right, 0px)) calc(24px + env(safe-area-inset-bottom, 0px)) 16px;
        box-sizing: border-box;
        background: var(--color-heading);
        box-shadow: -4px 0 16px rgba(0, 0, 0, 0.25);
        z-index: 1002;
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform 0.25s ease;
    }
    .site-nav.is-open {
        transform: translateX(0);
    }

    .site-nav a {
        padding: 12px 14px;
        font-size: 1rem;
    }

    /* ドロワー内の閉じるボタン（absolute配置は祖先のpaddingを継承しないため、safe-areaを個別に加算） */
    .site-nav-close {
        display: block;
        position: absolute;
        top: calc(10px + env(safe-area-inset-top, 0px));
        right: calc(10px + env(safe-area-inset-right, 0px));
        width: 44px;
        height: 44px;
        border: none;
        background: none;
        color: #ffffff;
        font-size: 1.5rem;
        line-height: 1;
        cursor: pointer;
    }
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.footer-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    /* PWA standalone起動時のホームバー対策（通常のブラウザ表示では env() が未対応/0pxのため無影響） */
    padding: 16px calc(20px + env(safe-area-inset-right, 0px)) calc(16px + env(safe-area-inset-bottom, 0px)) calc(20px + env(safe-area-inset-left, 0px));
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.footer-copyright {
    color: var(--color-muted);
    font-size: 0.85rem;
}

.footer-admin-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-admin-link a,
.footer-inner a {
    color: var(--color-muted);
    font-size: 0.85rem;
    text-decoration: none;
}

.footer-admin-link a:hover,
.footer-inner a:hover {
    text-decoration: underline;
}

.footer-admin-note {
    color: var(--color-muted-2);
    font-size: 0.75rem;
}

@media (max-width: 640px) {
    .footer-inner {
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: 10px;
        padding: 10px 12px;
        overflow-x: auto;
        scrollbar-width: none;
        white-space: nowrap;
    }

    .footer-inner::-webkit-scrollbar {
        display: none;
    }

    .footer-copyright,
    .footer-admin-link a,
    .footer-inner a {
        font-size: 0.72rem;
    }

    .footer-admin-link {
        flex: 0 0 auto;
        gap: 0;
    }

    .footer-admin-note {
        display: none;
    }
}

/* 管理者専用「閲覧モード」— 切替バー(通常時)・状態バナー(マスク中)。base.html末尾で全ページ共通に出す */
.view-as-switcher {
    position: fixed;
    left: 12px;
    bottom: 12px;
    z-index: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    font-size: 0.78rem;
}

.view-as-switcher-label {
    color: var(--color-muted);
    white-space: nowrap;
}

.view-as-switcher-form {
    margin: 0;
}

.view-as-switcher-btn {
    padding: 4px 10px;
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-heading);
    font-size: 0.78rem;
    cursor: pointer;
}

.view-as-switcher-btn:hover {
    background: var(--color-label-bg);
}

.view-as-banner {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 501;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 16px;
    background: var(--color-accent-dark);
    color: #ffffff;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
}

.view-as-banner-text {
    font-weight: bold;
    font-size: 0.9rem;
}

.view-as-banner-actions {
    display: flex;
    gap: 8px;
}

.view-as-banner-form {
    margin: 0;
}

.view-as-banner-btn {
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-md);
    background: transparent;
    color: #ffffff;
    font-size: 0.82rem;
    cursor: pointer;
}

.view-as-banner-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.view-as-banner-btn--exit {
    background: #ffffff;
    color: var(--color-accent-dark);
    font-weight: bold;
}

@media (max-width: 640px) {
    .view-as-switcher {
        left: 8px;
        bottom: 8px;
        max-width: calc(100vw - 16px);
        overflow-x: auto;
    }
}

/* Shared layout blocks */
.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.page-header {
    margin-bottom: 28px;
}

.page-header h1 {
    margin-bottom: 12px;
    font-size: 2rem;
    line-height: 1.4;
}

.section-label {
    margin: 0 0 8px;
    font-size: 0.8rem;
    font-weight: bold;
    letter-spacing: 0.08em;
    color: var(--color-muted-2);
}

.page-description,
.article-summary,
.article-card-summary,
.hero-description,
.error-description,
.tool-note {
    color: var(--color-muted);
}

/* Card */
.card,
.empty-state,
.wb-form {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card {
    width: 100%;
    box-sizing: border-box;
    padding: 16px;
}

.card a {
    color: var(--color-heading);
    text-decoration: none;
}

.card a:hover,
.breadcrumb a:hover,
.back-link:hover,
.text-link:hover,
.toc-item a:hover,
.article-body a:hover {
    text-decoration: underline;
}

.card-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.card-link .card {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card-link .card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Common small UI */
.category-label,
.tool-status {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: bold;
    border-radius: var(--radius-pill);
    line-height: 1.2;
}

.category-label {
    margin-bottom: 8px;
    padding: 4px 8px;
    font-size: 0.85rem;
    color: var(--color-muted);
    background-color: var(--color-label-bg);
}

.text-link,
.back-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: bold;
}

/* Home / Hero */
.hero {
    padding: 32px 0 40px;
}

.hero h1 {
    max-width: var(--hero-width);
    margin: 0 0 16px;
    font-size: 2.4rem;
    line-height: 1.35;
}

.hero-description {
    max-width: var(--hero-text-width);
    margin: 0;
    font-size: 1rem;
    line-height: 1.8;
}

.hero-actions,
.error-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-actions {
    margin-top: 24px;
}

.primary-button,
.secondary-button {
    display: inline-block;
    padding: 12px 18px;
    font-weight: bold;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: opacity 0.15s ease, transform 0.15s ease;
}

.primary-button,
a.primary-button {
    color: #ffffff;
    background-color: var(--color-heading);
}

.secondary-button,
a.secondary-button {
    color: var(--color-heading);
    background-color: var(--color-button-secondary);
}

.primary-button:hover,
.secondary-button:hover {
    opacity: 0.92;
    transform: translateY(-1px);
}

.home-section {
    margin-top: 44px;
}

/* 最新のコラム：ヒーロー直下で常時1件だけなので、見出し・タグ・タイトル・ステータス・
   一覧リンクを1行に収めるコンパクトなバー表示にして縦幅を抑える */
.home-section--column {
    margin-top: 26px;
}
.column-oneline {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 12px;
    padding: 12px 4px;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.column-oneline-label {
    flex-shrink: 0;
    font-size: 0.8rem;
    font-weight: bold;
    letter-spacing: 0.04em;
    color: var(--color-muted-2);
}
.column-oneline-link {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    flex: 1 1 auto;
    min-width: 0;
    color: inherit;
    text-decoration: none;
}
.column-oneline-link:hover .column-oneline-title {
    text-decoration: underline;
}
.column-oneline-link .tool-status {
    margin: 0;
}
.column-oneline-title {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.column-oneline-more {
    flex-shrink: 0;
    font-size: 0.9rem;
}

/* スマホ：1行だとラベルと一覧リンクに挟まれてタイトルが潰れるので2段に組み替える。
   1行目＝「最新のコラム … コラム一覧へ →」、2行目＝ステータス・タイトルをフル幅で。 */
@media (max-width: 768px) {
    .column-oneline {
        row-gap: 6px;
    }
    .column-oneline-label {
        order: 1;
    }
    .column-oneline-more {
        order: 2;
        margin-left: auto;   /* 1行目の右端へ寄せる */
    }
    .column-oneline-link {
        order: 3;
        flex-basis: 100%;    /* 2行目へフル幅で回す（タイトルに横幅を確保） */
    }
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 16px;
    margin-bottom: 18px;
}

.section-heading h2 {
    margin: 0;
}

/* Article list / cards */
.article-grid {
    align-items: stretch;
}

.article-card,
.tool-card {
    display: flex;
    flex-direction: column;
}

.article-card {
    min-height: 220px;
}

.article-card-title {
    margin: 0 0 12px;
    font-size: 1.2rem;
    line-height: 1.5;
}

.article-card-summary {
    margin: 0;
    line-height: 1.7;
    flex-grow: 1;
}

.article-card-footer {
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

/* バッジを1段目、日付＋読了時間を2段目に縦並び */
.article-meta-row {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-bottom: 8px;
}

.article-meta-row .card-label-row {
    margin-bottom: 0;
}

/* 2段目: 日付（左）と読了時間（右）を両端に */
.article-meta-sub {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
}

.article-meta-inline,
.article-header-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}


.reading-time,
.article-reading-time {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-muted-2);
    white-space: nowrap;
}

.article-reading-time {
    font-size: 0.9rem;
}

.article-header-meta {
    margin-bottom: 12px;
}

.article-list-meta {
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--color-muted-2);
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* 記事一覧の並べ替えコントロール */
.article-sort {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.article-sort-label {
    font-size: 0.9rem;
    color: var(--color-muted-2);
    margin-right: 4px;
}

.article-sort-btn {
    padding: 7px 14px;
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--color-heading);
    background-color: var(--color-button-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: opacity 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.article-sort-btn:hover {
    opacity: 0.92;
}

.article-sort-btn.is-active {
    color: #ffffff;
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

/* Category cards */
.category-card {
    min-height: 240px;
}

.category-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.category-count {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-muted-2);
    white-space: nowrap;
}

/* Exam pages: content-only card height for sparse cards (no summary to fill space) */
.exam-card-compact {
    min-height: 0;
}

.category-card-header .article-card-title {
    margin: 0;
}

/* Exam hub (/exam): 学科試験/口述試験 <details> トグル。開くと資格カードが降りてくる。 */
.exam-hub-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.exam-hub-item {
    padding: 0;
}

.exam-hub-summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 40px 20px;
    cursor: pointer;
    list-style: none;
    user-select: none;
    text-align: center;
}

.exam-hub-summary::-webkit-details-marker {
    display: none;
}

.exam-hub-summary .article-card-title {
    margin: 0;
    font-size: 1.6rem;
}

.exam-hub-panel {
    padding: 0 20px 24px;
}

/* 期選択画面（/exam/written/<qual>）: 期カードは科目ポップアップを開くボタン */
.exam-session-trigger {
    border: none;
    background-color: var(--color-surface);
    text-align: left;
    cursor: pointer;
    font: inherit;
    color: inherit;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.exam-session-trigger:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.exam-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.exam-modal-overlay.visible {
    display: flex;
}

.exam-modal-box {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px 24px 24px;
    max-width: 420px;
    width: 100%;
    box-shadow: var(--shadow-md);
}

.exam-modal-close {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 20px;
    line-height: 1;
    color: var(--color-muted);
    cursor: pointer;
}

.exam-modal-title {
    margin: 0 0 8px;
    font-size: 1.2rem;
    padding-right: 24px;
}

.exam-modal-hint {
    margin: 0 0 16px;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.exam-modal-subject-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.exam-modal-subject-link {
    display: block;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: var(--color-label-bg);
    color: var(--color-heading);
    font-weight: bold;
    text-decoration: none;
    transition: opacity 0.15s ease;
}

.exam-modal-subject-link:hover {
    opacity: 0.85;
}

.exam-modal-subject-disabled {
    display: block;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: var(--color-label-bg);
    color: var(--color-muted);
}

/* 学科 解説記事（/exam/written/.../<subject>）: 除外注記・問題カード・選択肢・正解トグル */
.exam-notice-numbers {
    margin: 8px 0 0;
    font-size: 0.9rem;
}

.exam-question-list {
    display: flex;
    flex-direction: column;
    gap: 28px;
    margin: 28px 0;
}

.exam-question {
    padding: 20px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    scroll-margin-top: 80px;
}

.exam-question-header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.exam-question-number {
    margin: 0;
    font-size: 1.1rem;
}

.exam-question-chips {
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.exam-chip {
    display: inline-block;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    background: var(--color-label-bg);
    color: var(--color-muted);
    font-size: 0.78rem;
}

.exam-chip--pattern {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
}

.exam-question-text {
    margin: 0 0 16px;
    line-height: 1.9;
    white-space: pre-wrap;
}

.exam-figure {
    margin: 0 0 16px;
}

.exam-figure img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.exam-choices {
    list-style: none;
    margin: 0 0 16px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.exam-choice {
    display: flex;
    gap: 8px;
    padding: 10px 14px;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    line-height: 1.7;
}

.exam-choice-number {
    flex-shrink: 0;
    color: var(--color-muted-2);
}

.exam-answer-toggle {
    margin: 0;
}

.exam-correct-answer {
    margin: 0 0 8px;
    font-weight: bold;
    color: var(--color-success-text);
}

.exam-choice-note {
    margin-left: 6px;
    font-size: 0.85rem;
    font-weight: normal;
    color: var(--color-muted);
}

.exam-explanation-empty {
    margin: 0;
    color: var(--color-muted);
}

.exam-choice {
    cursor: pointer;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.exam-choice:hover {
    border-color: var(--color-accent);
}

.exam-choice:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.exam-choice--selected {
    border-color: var(--color-accent);
}

.exam-choice--correct {
    background: var(--color-success-bg);
    border-color: var(--color-success-text);
}

.exam-choice--incorrect {
    background: var(--color-warning-bg);
    border-color: var(--color-warning-border);
}

.exam-answer-feedback {
    margin: -4px 0 16px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-weight: bold;
}

.exam-answer-feedback--correct {
    background: var(--color-success-bg);
    color: var(--color-success-text);
}

.exam-answer-feedback--incorrect {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
}

.exam-explanation-gate {
    margin-top: 8px;
}

.exam-explanation-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-accent);
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.exam-explanation-btn:hover {
    opacity: 0.85;
}

.exam-explanation-btn:disabled {
    cursor: default;
    opacity: 0.6;
}

.exam-explanation-remaining {
    font-size: 0.85rem;
    font-weight: normal;
    color: var(--color-muted);
}

.exam-explanation-locked {
    margin: 0;
    padding: 10px 14px;
    background: var(--color-label-bg);
    border-radius: var(--radius-md);
    color: var(--color-muted);
}

.exam-limit-notice {
    margin: 12px 0 0;
    padding: 10px 14px;
    background: var(--color-warning-bg);
    border-radius: var(--radius-md);
    color: var(--color-warning-text);
}

.exam-limit-teaser {
    display: inline-block;
    margin-top: 4px;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.exam-score-summary {
    margin: 24px 0;
    padding: 14px 18px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    font-weight: bold;
}

.exam-source {
    margin-top: 24px;
    font-size: 0.9rem;
    color: var(--color-muted);
}

.exam-source p {
    margin: 0 0 4px;
}

/* Article detail */
.article-page {
    max-width: var(--article-width);
    margin: 0 auto;
}

.breadcrumb {
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--color-muted-2);
}

.breadcrumb a {
    color: var(--color-muted-2);
    text-decoration: none;
}

.article-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
    margin-bottom: 12px;
    font-size: 2rem;
    line-height: 1.4;
}

.article-summary {
    margin: 0;
    font-size: 1rem;
    line-height: 1.7;
}

.article-content {
    margin-top: 28px;
    margin-bottom: 36px;
    font-size: 1.02rem;
    line-height: 2;
    color: var(--color-text);
    white-space: normal;
}

.article-updated {
    margin-top: 36px;
    padding: 16px 18px;
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-muted-2);
    border-radius: 8px;
    background-color: var(--color-label-bg);
}

.article-updated-date {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-heading);
}

.article-updated-note {
    margin: 8px 0 0;
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--color-muted-2);
}

/* シェアボタン（記事・コラム共通） */
.share-buttons {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background-color: var(--color-surface);
    color: var(--color-heading);
    font-size: 0.85rem;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.share-btn:hover {
    transform: translateY(-1px);
    border-color: var(--color-accent);
    color: var(--color-accent);
    text-decoration: none;
}

.share-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.share-btn-copy.is-copied {
    border-color: var(--color-success-text);
    color: var(--color-success-text);
}

.article-actions {
    margin-top: 24px;
    margin-bottom: 36px;
}

.article-list-notice {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: 8px;
    background-color: var(--color-label-bg);
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--color-muted-2);
}

.related-section {
    margin-top: 24px;
}

.related-section h2 {
    margin-bottom: 16px;
}

.related-inline {
    margin: 20px 0 28px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.related-ogp-link {
    display: block;
    padding: 12px 14px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-soft);
    border-top: 3px solid #5b8db8;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    color: inherit;
    text-decoration: none;
    transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.related-ogp-link:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.related-ogp-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-heading);
    margin: 0 0 4px;
    line-height: 1.0;
}

.related-ogp-summary {
    font-size: 16px;
    color: var(--color-muted);
    margin: 0 0 6px;
    line-height: 1.3;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-ogp-meta {
    font-size: 12px;
    color: var(--color-muted-2);
}

/* ツール引用カード（:::tool） */
.tool-ogp-link {
    border-top-color: #2f9e8f;
}

/* フラッシュカードのデッキ引用カード（:::deck・カード未指定時） */
.deck-ogp-link {
    border-top-color: #c2811b;
}

.video-container {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 */
    margin: 24px 0;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* TOC */
.toc {
    margin: 24px 0 32px;
    padding: 20px;
    background-color: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.toc-details {
    margin: 0;
}

.toc-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin: 0;
    padding: 0.5rem 0.75rem;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-heading);
    cursor: pointer;
    list-style: none;
    user-select: none;
    border-radius: 6px;
    transition: background-color 0.15s ease;
}

.toc-title::-webkit-details-marker {
    display: none;
}

.toc-title:hover {
    background-color: #edf2f7;
}

.toc-title-text {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.toc-icon {
    font-size: 0.95rem;
    color: var(--color-muted);
}

.toc-hint {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--color-muted);
}

.toc-chevron {
    font-size: 0.7rem;
    color: var(--color-muted);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.toc-details[open] .toc-chevron,
.faq-item[open] .toc-chevron,
.md-toggle[open] .toc-chevron,
.exam-hub-item[open] .toc-chevron {
    transform: rotate(180deg);
}

.toc-details[open] .toc-hint {
    display: none;
}

.toc-details[open] .toc-list {
    margin-top: 10px;
    padding-left: 0.75rem;
}

.toc-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.toc-item {
    margin-bottom: 10px;
}

.toc-item:last-child {
    margin-bottom: 0;
}

.toc-item a {
    color: var(--color-heading);
    text-decoration: none;
    line-height: 1.6;
}

.toc-level-3 {
    padding-left: 16px;
}

/* Help / FAQ */
.help-tabs {
    display: flex;
    gap: 8px;
    margin: 24px 0 8px;
}

.help-tab {
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    background-color: var(--color-label-bg);
    color: var(--color-muted);
    text-decoration: none;
    font-size: 0.9rem;
}

.help-tab.active {
    background-color: var(--color-heading);
    color: #fff;
}

.faq-group {
    margin-top: 32px;
}

.faq-group h2 {
    margin-bottom: 12px;
    font-size: 1.3rem;
}

.faq-item {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
}

.faq-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 0;
    font-weight: 600;
    color: var(--color-heading);
    cursor: pointer;
    list-style: none;
    user-select: none;
}

.faq-summary::-webkit-details-marker {
    display: none;
}

.faq-answer {
    margin-top: 12px;
}

.known-bugs-section {
    margin-top: 24px;
}

.known-bugs-empty {
    color: var(--color-muted);
    padding: 16px 0;
}

.known-bug-date {
    margin-left: auto;
    font-size: 0.82rem;
    color: var(--color-muted);
    white-space: nowrap;
}

.known-bug-meta {
    margin: 4px 0 0;
    font-size: 0.82rem;
    color: var(--color-muted);
}

.bug-status-investigating {
    color: var(--color-notice-text);
    background-color: var(--color-notice-bg);
}

.bug-status-in-progress {
    color: #ffffff;
    background-color: var(--color-accent);
}

.bug-status-fixed {
    color: #ffffff;
    background-color: var(--color-success-text);
}

.bug-status-pending,
.bug-status-other {
    color: var(--color-muted);
    background-color: var(--color-label-bg);
}

.contact-cta {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
}

/* Markdown article body */
.article-body h2,
.article-body h3,
.article-body h4 {
    color: var(--color-heading);
    line-height: 1.5;
    scroll-margin-top: 90px;
}

.article-body h2 {
    margin-top: 48px;
    margin-bottom: 18px;
    padding-bottom: 10px;
    font-size: 1.65rem;
    border-bottom: 2px solid var(--color-border);
}

.article-body h3 {
    margin-top: 32px;
    margin-bottom: 14px;
    font-size: 1.28rem;
}

.article-body h4 {
    margin-top: 24px;
    margin-bottom: 12px;
    font-size: 1.08rem;
}

.article-body p {
    margin: 0 0 18px;
    line-height: 2;
}

.article-body ul,
.article-body ol {
    margin: 0 0 22px 24px;
    padding: 0;
    line-height: 1.95;
}

.article-body li {
    margin-bottom: 8px;
}

/* Callout blocks */
/* トグル（:::toggle）— 目次と同じ見た目 */
.md-toggle {
    margin: 24px 0;
    padding: 6px 10px;
    background-color: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.md-toggle-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin: 0;
    padding: 0.5rem 0.75rem;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-heading);
    cursor: pointer;
    list-style: none;
    user-select: none;
    border-radius: 6px;
    transition: background-color 0.15s ease;
}

.md-toggle-title::-webkit-details-marker {
    display: none;
}

.md-toggle-title:hover {
    background-color: #edf2f7;
}

.md-toggle-title-text {
    min-width: 0;
}

.md-toggle-body {
    padding: 4px 0.75rem 8px;
}

.md-toggle-body > :first-child {
    margin-top: 0;
}

.md-toggle-body > :last-child {
    margin-bottom: 0;
}

.callout {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    margin: 24px 0;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    font-size: 0.97rem;
    line-height: 1.8;
}

.callout-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.callout-body {
    flex: 1;
    min-width: 0;
}

.callout-body p:last-child {
    margin-bottom: 0;
}

.callout-note {
    background-color: #f0f4ff;
    border-color: #c5d3f7;
    color: #2c3e7a;
}

.callout-tip {
    background-color: #f0faf2;
    border-color: #a8ddb5;
    color: #1a5c2e;
}

.callout-warning {
    background-color: var(--color-warning-bg);
    border-color: var(--color-warning-border);
    color: var(--color-warning-text);
}

.callout-quote {
    background-color: #f4f5f6;
    border-color: #cfd3d8;
    color: #2a2d31;
}

.article-body blockquote {
    margin: 24px 0;
    padding: 14px 18px;
    border-left: 4px solid var(--color-border-soft);
    background-color: var(--color-surface-alt);
    color: var(--color-muted);
    line-height: 1.8;
}

.article-body hr {
    margin: 32px 0;
    border: none;
    border-top: 1px solid var(--color-border);
}

.article-body strong {
    font-weight: bold;
}

.article-body a {
    color: var(--color-heading);
    text-decoration: underline;
}

.article-body a.related-ogp-link,
.article-body a.related-ogp-link:hover {
    text-decoration: none;
}

.article-body code {
    padding: 2px 6px;
    background-color: var(--color-label-bg);
    border-radius: var(--radius-sm);
    font-size: 0.95em;
}

.article-body pre {
    overflow-x: auto;
    margin: 24px 0;
    padding: 16px;
    background-color: var(--color-heading);
    color: #ffffff;
    border-radius: var(--radius-lg);
    line-height: 1.7;
}

.article-body pre code {
    padding: 0;
    background: none;
    color: inherit;
    border-radius: 0;
}

.article-body table {
    width: 100%;
    margin: 24px 0;
    border-collapse: collapse;
    font-size: 0.97rem;
    line-height: 1.7;
}

.article-body th,
.article-body td {
    padding: 10px 16px;
    border: 1px solid var(--color-border);
    text-align: left;
    vertical-align: top;
}

.article-body th {
    background-color: var(--color-label-bg);
    font-weight: bold;
    color: var(--color-heading);
}

.article-body tr:nth-child(even) td {
    background-color: #f9fafb;
}

/* Lead section */
.article-lead {
    margin: 28px 0 36px;
    padding: 20px 22px;
    background-color: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.article-lead h2 {
    margin-top: 0;
    padding-bottom: 0;
    font-size: 1.4rem;
    border-bottom: none;
}

.article-lead p:last-child {
    margin-bottom: 0;
}

.article-grid > .card-link {
    display: block;
}

.article-grid > .card-link .card {
    height: 100%;
    box-sizing: border-box;
}

/* Tools */
.tool-card {
    min-height: 230px;
}

.tool-card-header {
    margin-bottom: 12px;
}

.tool-status {
    margin: 0 0 10px;
    padding: 4px 10px;
}

.status-released {
    color: var(--color-success-text);
    background-color: var(--color-success-bg);
}

.status-active {
    color: #1a4a7a;
    background-color: #e3f0fb;
}

.status-progress {
    color: #ffffff;
    background-color: var(--color-accent);
}

.status-planned {
    color: var(--color-muted);
    background-color: var(--color-label-bg);
}

.tool-card--planned {
    opacity: 0.6;
}

/* 新ツール（NEW）の緑テーマ */
.tool-status-new {
    color: #ffffff;
    background-color: var(--color-success-text);
    letter-spacing: 0.04em;
}

.tool-card--new {
    border-color: #a7d7b6;
    border-top: 3px solid var(--color-success-text);
}

/* 開発中ツールの青テーマ */
.tool-card--dev {
    border-color: #b3d0f5;
    border-top: 3px solid var(--color-accent);
}

.tool-card-footer {
    margin-top: auto;
    padding-top: 20px;
}

.tool-note {
    font-size: 0.9rem;
}

/* ツール一覧（/tools）: グループ見出しセクション */
.tools-group {
    margin-top: 44px;
}

.tools-group:first-child {
    margin-top: 0;
}

.tools-group-description {
    margin: 4px 0 0;
    font-size: 0.95rem;
}

/* フラッグシップ（flight-prep）: 背景を軽く強調し、カードを横長1枚で見せる */
.tools-group--flagship {
    padding: 20px;
    background: var(--color-highlight-bg);
    border-radius: var(--radius-lg);
}

.tools-group--flagship .tools-group-grid {
    grid-template-columns: 1fr;
}

/* ツール一覧（/tools）: カテゴリへのクイックジャンプ帯。
   スマホから来る学習ツール目的のユーザーが目的のグループまで大量スクロールせずに
   ワンタッチで移動できるようにする帯状のチップナビ。position:sticky で
   スクロール中も画面上端に残り続ける（.site-header 自体は sticky ではないので、
   このナビが画面上端に到達した時点でこれ自身が貼り付く）。 */
.tools-quicknav {
    position: sticky;
    top: 0;
    z-index: 50;
    margin: 0 0 32px;
    padding: 10px 0;
    background: rgba(245, 246, 248, 0.92);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--color-border);
}

.tools-quicknav-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tools-quicknav-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--color-muted);
    background-color: var(--color-label-bg);
    border-radius: var(--radius-pill);
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.tools-quicknav-chip:hover {
    background-color: var(--color-button-secondary);
    text-decoration: none;
}

.tools-quicknav-chip.is-active {
    color: #ffffff;
    background-color: var(--color-accent);
}

.tools-quicknav-icon {
    font-size: 1rem;
    line-height: 1;
}

/* ジャンプ着地時、クイックジャンプ帯の下に見出しが隠れないようスクロール位置をずらす */
.tools-group {
    scroll-margin-top: 68px;
}

@media (max-width: 768px) {
    /* 横スクロールにはせず、2列グリッドで折り返す（横スクロールUIは避ける方針）。
       帯の高さが複数行になる分、下の .tools-group の scroll-margin-top を広めに取り直す。 */
    .tools-quicknav-inner {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .tools-quicknav-chip {
        justify-content: center;
        padding: 10px 12px;
        font-size: 0.85rem;
        text-align: center;
    }

    .tools-group {
        scroll-margin-top: 128px;
    }
}

/* Error page */
.error-page {
    max-width: var(--error-width);
    margin: 60px auto;
    text-align: center;
}

.error-page h1 {
    margin-bottom: 16px;
    font-size: 2rem;
    line-height: 1.4;
}

.error-description {
    margin-bottom: 24px;
    line-height: 1.7;
}

.error-actions {
    justify-content: center;
}

/* Forms */
.wb-form {
    padding: 24px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0; /* グリッド/フレックス内で内容より狭く縮められるように */
}

.form-group label {
    font-size: 0.95rem;
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    box-sizing: border-box;
    width: 100%;
    max-width: 100%;
    padding: 10px 12px;
    font-size: 1rem;
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    resize: vertical;
}

.form-actions {
    margin-top: 24px;
}

.result-card {
    min-width: 0;
}

.warning-card {
    background-color: var(--color-warning-bg);
    border: 1px solid var(--color-warning-border);
}

/* W&B結果: CGチャートの枠（旧: wb_result.html の inline style）
   スマホでは全幅にする（max-width:50% + min-width:280px は375pxで窮屈） */
.wb-chart-frame {
    max-width: 85%;
    min-width: 280px;
    margin: 0 auto;
}

/* エンベロープ図の上に置く「入力値＋各段階の結果」サマリー */
.wb-chart-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 32px;
    margin-bottom: 20px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--color-border);
}
.wb-summary-col { flex: 1 1 260px; min-width: 0; }
.wb-summary-head {
    font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase;
    color: var(--color-muted); margin: 0 0 8px;
}
.wb-summary-list { list-style: none; margin: 0; padding: 0; font-size: 0.9rem; }
.wb-summary-list li {
    display: flex; justify-content: space-between; gap: 12px;
    padding: 4px 0; border-bottom: 1px dotted var(--color-border);
}
.wb-summary-list li:last-child { border-bottom: none; }
.wb-summary-list li > span { color: var(--color-muted); }
.wb-summary-list li > strong { text-align: right; white-space: nowrap; }
.wb-summary-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.wb-summary-table th[scope="row"] {
    text-align: left; font-weight: normal; color: var(--color-muted);
    padding: 5px 8px 5px 0;
}
.wb-summary-table td { text-align: right; padding: 5px 0; white-space: nowrap; }
.wb-summary-table tr { border-bottom: 1px dotted var(--color-border); }
.wb-summary-table tr:last-child { border-bottom: none; }
.wb-summary-table tr.is-warn th,
.wb-summary-table tr.is-warn td { color: var(--color-warning-text); font-weight: bold; }
.wb-summary-list .warning-text,
.wb-summary-table .warning-text { font-size: 0.78rem; font-weight: bold; }

@media (max-width: 768px) {
    .wb-chart-frame {
        max-width: 100%;
        min-width: 0;
    }
}

/* Preset mode: locked config fields */
.form-group input.preset-locked {
    background: #f0f3f6;
    color: var(--color-muted);
    cursor: not-allowed;
    border-color: #d0d8e0;
}

/* Preset mode: required user input fields */
.form-group input.preset-required {
    border-color: var(--color-accent);
    background: var(--color-highlight-bg);
}

.warning-text {
    font-weight: bold;
    color: var(--color-warning-text);
}

.input-list {
    margin: 0;
    padding-left: 20px;
    line-height: 1.8;
}

/* Empty state */
.empty-state {
    padding: 24px;
}

.article-content img {
  display: block;
  max-width: 500px;
  width: 100%;
  height: auto;
  margin: 20px auto;
}

/* Responsive */
@media (max-width: 768px) {
    .site-main {
        padding: 20px 16px 32px;
    }

    /* カードグリッドをスマホで1列に */
    .card-container,
    .result-grid {
        grid-template-columns: 1fr;
    }

    /* スマホでは入力欄を必ず1列・全幅に（最後の行のはみ出し/左寄りを防ぐ） */
    /* minmax(0, 1fr) で、内容（長い select 等）が画面幅を超えても列が縮むようにする */
    .form-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero {
        padding: 20px 0 28px;
    }

    .hero h1 {
        font-size: 1.9rem;
    }

    .page-header h1 {
        font-size: 1.7rem;
    }

    .section-heading {
        flex-direction: column;
        align-items: flex-start;
    }

    .article-page {
        max-width: 100%;
    }

    .article-header h1 {
        font-size: 1.7rem;
    }

    .article-content {
        font-size: 1rem;
        line-height: 1.9;
    }

    .article-content img {
        max-width: 90%;
    }

    .article-body h2 {
        font-size: 1.4rem;
    }

    .article-body h3 {
        font-size: 1.18rem;
    }

    /* 幅の広いテーブルを横スクロール対応に */
    .article-body table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* TOCリンクで飛んだ先の見出しがヘッダーに隠れないよう余白を増やす */
    .article-body h2,
    .article-body h3,
    .article-body h4 {
        scroll-margin-top: 120px;
    }
}

/* ================================================
   Flashcard Tool
   ================================================ */

.fc-view {
    display: none;
}

.fc-input,
.fc-select {
    box-sizing: border-box;
    padding: 10px 12px;
    font-size: 1rem;
    font-family: var(--font-sans);
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
}

.fc-input {
    flex: 1;
    min-width: 0;
}

.fc-select {
    width: 100%;
}

/* Deck list */
.fc-deck-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fc-deck-item {
    width: auto;
    box-sizing: border-box;
    padding: 16px 20px;
}

.fc-deck-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.fc-deck-name {
    margin: 0;
    font-size: 1.1rem;
}

.fc-deck-description {
    margin: -4px 0 10px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.fc-card-count {
    font-size: 0.85rem;
    color: var(--color-muted-2);
    white-space: nowrap;
}

.fc-btn-plain {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    padding: 0;
    color: var(--color-heading);
    font-weight: bold;
}

.fc-btn-plain:hover {
    text-decoration: underline;
}

a.fc-btn-plain {
    display: inline-block;
    text-decoration: none;
}

.primary-button:disabled,
.secondary-button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.fc-empty {
    padding: 32px 24px;
    color: var(--color-muted);
    text-align: center;
}

.fc-view-nav {
    margin-bottom: 16px;
}

.fc-face-label-sm {
    font-size: 0.75rem;
    font-weight: bold;
    color: var(--color-muted-2);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Deck page */
.fc-deck-start-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 32px;
}

.fc-start-panel {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fc-start-title {
    margin: 0;
    font-size: 1.1rem;
}

.fc-start-note {
    margin: -6px 0 0;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.fc-start-disabled-note {
    margin: 4px 0 0;
    font-size: 0.85rem;
    color: var(--color-warning-text);
}

.fc-card-list-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 12px;
}

.fc-card-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.fc-cl-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    align-items: center;
    gap: 12px;
    width: 100%;
    box-sizing: border-box;
    text-align: left;
    font: inherit;
    color: inherit;
    cursor: pointer;
    background: var(--color-surface);
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 12px 16px;
}

.fc-cl-front {
    font-weight: bold;
    color: var(--color-heading);
    white-space: pre-wrap;
    word-break: break-word;
}

.fc-cl-back-cell {
    white-space: pre-wrap;
    word-break: break-word;
}

.fc-cl-hint {
    font-size: 0.85rem;
    color: var(--color-muted-2);
}

.fc-cl-back {
    display: none;
}

.fc-cl-row.fc-cl-open {
    background: var(--color-highlight-bg);
}

.fc-cl-row.fc-cl-open .fc-cl-hint {
    display: none;
}

.fc-cl-row.fc-cl-open .fc-cl-back {
    display: block;
}

/* Study / Test shared header */
.fc-study-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.fc-progress-text {
    font-size: 0.95rem;
    color: var(--color-muted-2);
}

.fc-round-badge {
    font-size: 0.8rem;
    font-weight: bold;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    background: var(--color-label-bg);
    color: var(--color-muted-2);
}

.fc-undo-btn {
    margin-left: auto;
}

.fc-progress-bar {
    height: 4px;
    border-radius: var(--radius-pill);
    background: var(--color-label-bg);
    overflow: hidden;
    margin-bottom: 20px;
}

.fc-progress-fill {
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: var(--color-heading);
    transition: width 0.25s ease;
}

/* Flip card */
.fc-card-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

.fc-flip-card {
    perspective: 1000px;
    width: 100%;
    max-width: 640px;
    cursor: pointer;
}

.fc-flip-inner {
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.45s ease;
    height: 260px;
}

.fc-flip-inner.fc-flipped {
    transform: rotateY(180deg);
}

.fc-flip-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 28px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow-y: auto;
}

.fc-flip-back {
    transform: rotateY(180deg);
    background: var(--color-highlight-bg);
}

.fc-face-label {
    margin: 0 0 12px;
    font-size: 0.78rem;
    font-weight: bold;
    letter-spacing: 0.08em;
    color: var(--color-muted-2);
    text-transform: uppercase;
    flex-shrink: 0;
}

.fc-face-text {
    font-size: 1.4rem;
    line-height: 1.6;
    color: var(--color-heading);
    word-break: break-word;
    white-space: pre-wrap;
}

.fc-flip-hint {
    margin-top: 10px;
    font-size: 0.83rem;
    color: var(--color-muted-2);
    text-align: center;
}

/* Study card swipe (学習モードのみ。記事埋め込みカードには影響させない) */
#fc-study-card {
    touch-action: pan-y;
}

#fc-study-card.fc-swiping {
    transition: none;
}

#fc-study-card.fc-snap-back {
    transition: transform 0.2s ease;
}

#fc-study-card.fc-fly-out {
    transition: transform 0.25s ease, opacity 0.25s ease;
    opacity: 0;
}

#fc-study-card.fc-swipe-right .fc-flip-back {
    box-shadow: 0 0 0 3px var(--color-study-green) inset;
}

#fc-study-card.fc-swipe-left .fc-flip-back {
    box-shadow: 0 0 0 3px var(--color-warning-border) inset;
}

/* Study answer buttons */
.fc-study-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.fc-answer-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: bold;
    font-family: var(--font-sans);
    border: 1.5px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: opacity 0.15s, transform 0.15s;
}

.fc-answer-btn:hover {
    opacity: 0.88;
    transform: translateY(-1px);
}

.fc-btn-learning {
    color: var(--color-warning-text);
    background: var(--color-warning-bg);
    border-color: var(--color-warning-border);
}

.fc-btn-known {
    color: var(--color-success-text);
    background: var(--color-success-bg);
    border-color: var(--color-study-green);
}

.fc-btn-key {
    display: inline-block;
    font-size: 0.73rem;
    font-weight: normal;
    padding: 2px 5px;
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.1);
    color: inherit;
}

@keyframes fc-known-pulse {
    0%   { box-shadow: 0 0 0 0px rgba(40, 167, 69, 0); }
    35%  { box-shadow: 0 0 0 8px rgba(40, 167, 69, 0.35); }
    100% { box-shadow: 0 0 0 0px rgba(40, 167, 69, 0); }
}

.fc-flip-card.fc-known-anim {
    animation: fc-known-pulse 0.35s ease;
}

@keyframes fc-learning-pulse {
    0%   { box-shadow: 0 0 0 0px rgba(255, 153, 0, 0); }
    35%  { box-shadow: 0 0 0 8px rgba(255, 153, 0, 0.35); }
    100% { box-shadow: 0 0 0 0px rgba(255, 153, 0, 0); }
}

.fc-flip-card.fc-learning-anim {
    animation: fc-learning-pulse 0.35s ease;
}

.fc-toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: bold;
}

/* Study completion */
.fc-results-summary {
    margin-bottom: 16px;
    color: var(--color-muted);
}

.fc-results-table {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.fc-result-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
}

.fc-result-card-text {
    font-size: 0.93rem;
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    word-break: break-word;
}

.fc-result-sep {
    color: var(--color-muted-2);
}

.fc-attempts-badge {
    font-size: 0.8rem;
    font-weight: bold;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    white-space: nowrap;
}

.fc-attempts-easy {
    color: var(--color-success-text);
    background: var(--color-success-bg);
}

.fc-attempts-mid {
    color: #856404;
    background: #fff3cd;
}

.fc-attempts-hard {
    color: var(--color-warning-text);
    background: var(--color-warning-bg);
}

.fc-complete-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 8px;
}

/* Test: question area */
.fc-test-question-area {
    max-width: 640px;
    margin: 0 auto;
}

.fc-test-question-card {
    margin-bottom: 20px;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.fc-test-q-text {
    font-size: 1.4rem;
    line-height: 1.6;
    color: var(--color-heading);
    white-space: pre-wrap;
    word-break: break-word;
}

/* Test: options */
.fc-test-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.fc-option-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    text-align: left;
    transition: border-color 0.15s, background 0.15s;
}

.fc-option-btn:hover:not(:disabled) {
    border-color: var(--color-border-soft);
    background: var(--color-button-secondary);
}

.fc-option-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    font-size: 0.85rem;
    font-weight: bold;
    border-radius: var(--radius-sm);
    background: var(--color-label-bg);
    color: var(--color-muted-2);
}

.fc-option-text {
    flex: 1;
    white-space: pre-wrap;
    word-break: break-word;
    text-align: left;
}

.fc-option-btn.fc-option-correct {
    border-color: var(--color-study-green);
    background: var(--color-success-bg);
    color: var(--color-success-text);
}

.fc-option-btn.fc-option-correct .fc-option-num {
    background: var(--color-study-green);
    color: var(--color-success-text);
}

.fc-option-btn.fc-option-wrong {
    border-color: var(--color-warning-border);
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
}

.fc-option-btn.fc-option-wrong .fc-option-num {
    background: var(--color-warning-border);
    color: var(--color-warning-text);
}

.fc-option-btn:disabled {
    cursor: default;
}

.fc-test-nav {
    text-align: right;
}

/* Test: score */
.fc-test-score-box {
    margin-bottom: 20px;
}

.fc-score-display {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 8px;
}

.fc-score-num {
    font-size: 2.4rem;
    font-weight: bold;
    color: var(--color-heading);
}

.fc-score-pct {
    font-size: 1.4rem;
    color: var(--color-muted);
}

.fc-score-label {
    margin: 0;
    color: var(--color-muted);
}

/* Test: answer review */
.fc-test-answer-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.fc-test-answer-row {
    display: flex;
    gap: 14px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    background: var(--color-surface);
}

.fc-test-answer-row.fc-answer-correct {
    background: var(--color-success-bg);
}

.fc-test-answer-row.fc-answer-wrong {
    background: var(--color-warning-bg);
}

.fc-answer-num {
    font-size: 1.1rem;
    font-weight: bold;
    flex-shrink: 0;
    width: 24px;
    line-height: 1.6;
}

.fc-answer-correct .fc-answer-num {
    color: var(--color-success-text);
}

.fc-answer-wrong .fc-answer-num {
    color: var(--color-warning-text);
}

.fc-answer-detail {
    flex: 1;
    font-size: 0.93rem;
    line-height: 1.7;
    word-break: break-word;
}

.fc-answer-question {
    font-weight: bold;
    color: var(--color-heading);
    margin-bottom: 2px;
}

.fc-answer-your {
    color: var(--color-warning-text);
}

.fc-answer-correct-val {
    color: var(--color-success-text);
}

/* Flashcard responsive */
@media (max-width: 768px) {
    .fc-deck-start-grid {
        grid-template-columns: 1fr;
    }

    .fc-cl-row {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .fc-flip-face {
        padding: 20px 16px;
    }

    .fc-flip-inner {
        height: 220px;
    }

    .fc-face-text {
        font-size: 1.2rem;
    }

    .fc-test-q-text {
        font-size: 1.2rem;
    }

    .fc-score-num {
        font-size: 1.8rem;
    }

    .fc-score-pct {
        font-size: 1.1rem;
    }
}
/* ==== フラッシュメッセージ（base.html 共通） ==== */
.flash-messages {
    max-width: 720px;
    margin: 0 auto 16px;
}

.flash {
    padding: 10px 12px;
    border-radius: var(--radius-md);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.flash-success {
    background-color: var(--color-success-bg);
    color: var(--color-success-text);
}

.flash-error {
    background-color: var(--color-warning-bg);
    color: var(--color-warning-text);
    border: 1px solid var(--color-warning-border);
}

/* ==== 認証・アカウントページ ==== */
.auth-wrap {
    max-width: 400px;
    margin: 48px auto;
}

.auth-wrap .card {
    margin-bottom: 16px;
}

.auth-title {
    font-size: 1.4rem;
}

.auth-note {
    font-size: 0.85rem;
    color: var(--color-muted);
}

.auth-remember {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
}

.auth-links {
    text-align: center;
    font-size: 0.9rem;
}

.auth-links-sep {
    margin: 0 6px;
    color: var(--color-muted);
}

.auth-unverified-card {
    border: 1px solid var(--color-warning-border);
}

.auth-unverified-card p {
    font-size: 0.9rem;
}

.account-wrap {
    max-width: 640px;
    margin: 32px auto;
    display: grid;
    gap: 20px;
}

.account-section-title {
    font-size: 1.1rem;
    margin-top: 0;
}

.account-info {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 6px 16px;
    margin: 0;
    font-size: 0.95rem;
}

.account-info dt {
    color: var(--color-muted);
}

.account-info dd {
    margin: 0;
    word-break: break-all;
}

.account-pending-note {
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    background-color: var(--color-warning-bg);
    color: var(--color-warning-text);
    border: 1px solid var(--color-warning-border);
    font-size: 0.85rem;
}

.account-danger {
    border: 1px solid var(--color-warning-border);
}

.account-delete-button {
    border: 1px solid var(--color-warning-border);
    background-color: var(--color-warning-bg);
    color: var(--color-warning-text);
    border-radius: var(--radius-md);
    padding: 10px 20px;
    font-size: 0.95rem;
    cursor: pointer;
}

.account-delete-button:hover {
    filter: brightness(0.97);
}

/* ============================================================
   ログインユーザー向け機能（あいさつ・個人化・いいね数・お気に入り・
   マイページ・マイデッキ・お問い合わせ・登録案内ポップアップ）
   ============================================================ */

/* ホームのあいさつ */
.hero-greeting {
    font-size: 1.05rem;
    font-weight: bold;
    color: var(--color-heading);
    margin: 0 0 10px;
}

/* 未ログイン向けの控えめな登録案内バナー */
.home-account-banner {
    margin: 16px auto 0;
    max-width: var(--hero-text-width);
    padding: 9px 14px;
    background-color: var(--color-label-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    color: var(--color-muted);
    line-height: 1.55;
}
.home-account-banner .text-link {
    white-space: nowrap;
}

.home-section-note {
    font-size: 0.8rem;
    font-weight: normal;
    color: var(--color-muted);
    margin-left: 6px;
}

/* マイ空港（ホーム最上部、遅延読み込みミニカード。static/js/home_airports.js が本文を差し込む） */
.home-airport-card { min-height: auto; }
.home-airport-body {
    margin-top: 10px;
    min-height: 44px;
    font-size: 0.82rem;
    color: var(--color-muted);
    line-height: 1.6;
}
.home-airport-line { margin: 0 0 2px; color: var(--color-text); }
.home-airport-line--warn { color: var(--color-warning-text); font-weight: 700; }
.home-airport-line--muted { color: var(--color-muted); }
.home-airport-empty-note {
    margin: 12px 0 0;
    font-size: 0.88rem;
    color: var(--color-muted);
}

/* 記事カードのいいね数バッジ（.article-card-footer のレイアウトは前半のカード定義に統合済み） */
.like-count-badge {
    font-size: 0.85rem;
    color: var(--color-notice-text);
    white-space: nowrap;
}

/* ツール一覧のお気に入り★ボタン */
/* グリッドの直下は .tool-card-wrap なので、等高チェーン
   （.tool-card-wrap → .card-link → .card を height:100% で貫通）をここで作り直す。 */
.tool-card-wrap {
    position: relative;
    display: flex;
}
.tool-card-wrap > .card-link {
    display: flex;
    flex: 1;
    min-width: 0;
}
.tool-card-wrap > .card-link > .card {
    width: 100%;
    height: 100%;
}
/* お気に入り★と重ならないよう、★表示カードはヘッダー右に余白を確保 */
.tool-card-wrap .tool-card-header {
    padding-right: 44px;
}
.tool-fav-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
    width: 34px;
    height: 34px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    line-height: 1;
    color: var(--color-border-soft);
    transition: transform 0.12s ease, color 0.12s ease;
}
/* 見た目は34pxのまま、タップ判定を44pxに広げる（アクセシビリティ） */
.tool-fav-btn::before {
    content: "";
    position: absolute;
    inset: -5px;
}
.tool-fav-btn:hover { transform: scale(1.15); }
.tool-fav-btn .tool-fav-star { font-size: 1.4rem; }
.tool-fav-btn.is-fav { color: var(--color-fav-star); }
.tool-fav-btn:disabled { opacity: 0.5; cursor: default; }
/* ログアウト時の★：グレーのまま、押すとログインへ誘導するリンク */
.tool-fav-btn--locked {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

/* ─── ログイン誘導の共通ロック表示（.column-lock-box / .home-account-banner と同トーン） ─── */
.locked-feature {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    background-color: var(--color-label-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}
.locked-feature-icon { flex: none; font-size: 1.1rem; line-height: 1.5; }
.locked-feature-text { margin: 0; }
.locked-feature-actions { margin: 6px 0 0; }
.locked-feature-sep { color: var(--color-border); margin: 0 2px; }
/* 記事いいね・成績など、本文中に小さく添えるノート版 */
.locked-feature--note {
    margin-top: 14px;
    font-size: 0.85rem;
}

/* ─── ホーム「最近の更新」：記事・ツールと同じカードだと過剰なので、コンパクトなリスト表示 ─── */
.update-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--color-border); }
.update-list-item { border-bottom: 1px solid var(--color-border); }
.update-list-row {
    display: block;
    padding: 14px 4px;
    color: inherit;
    text-decoration: none;
}
a.update-list-row:hover { background-color: var(--color-label-bg); }
.update-list-head {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 4px;
}
/* .tool-status 共通ルールの margin: 0 0 10px はカード縦積み用。
   このflex行では不要で、付いたままだとチップがタイトルより上にずれて見える。 */
.update-list-head .tool-status { margin: 0; }
/* アクセス必須ステータス（ログイン限定・有料）は行の右端へ寄せる。
   後続の NEW バッジもこの塊のまま右へ続く。 */
.update-list-head .update-access-badge { margin-left: auto; }
.update-list-title { font-weight: bold; color: var(--color-heading); }
.update-list-body { margin: 0; font-size: 0.88rem; color: var(--color-muted); }
.update-list-body :is(p) { margin: 0; }
.update-tag {
    letter-spacing: 0.02em;
}
.update-tag-tool { color: #ffffff; background-color: var(--color-success-text); }
.update-tag-feature { color: #ffffff; background-color: var(--color-accent); }
.update-tag-column { color: var(--color-mydeck-accent); background-color: var(--color-mydeck-accent-bg); }
.update-tag-improvement { color: var(--color-notice-text); background-color: var(--color-notice-bg); }
.update-tag-notice { color: var(--color-warning-text); background-color: var(--color-warning-bg); }
.update-tag-article { color: var(--color-text); background-color: var(--color-label-bg); }
/* NEW アクセントは既定で隠し、前回訪問以降の項目（.is-new）だけ表示する */
.update-new-badge { display: none; }
[data-update-date].is-new .update-new-badge { display: inline-block; }

/* 記事・ツールカードの NEW チップ。category-label と同じ行（.card-label-row）に並べ、
   バッジの有無でタイトルの縦位置がずれないようにする。 */
.card-label-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.card-label-row .category-label,
.card-label-row .card-new-badge {
    margin: 0;
}

.card-new-badge {
    display: inline-block;
}

/* フラッシュカード：マイデッキ管理パネル */
.fc-mydecks-panel {
    background: var(--color-label-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    margin-bottom: 24px;
}
.fc-mydecks-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.fc-mydecks-title { font-size: 1.05rem; margin: 0; color: var(--color-heading); }
.fc-mydeck-new { padding: 8px 14px; font-size: 0.9rem; }
.fc-mydeck-limit { font-size: 0.85rem; color: var(--color-muted); }
.fc-mydeck-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.fc-mydeck-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 10px 14px;
}
.fc-mydeck-link { display: flex; align-items: baseline; gap: 10px; text-decoration: none; color: var(--color-heading); font-weight: bold; }
.fc-mydeck-actions { display: flex; align-items: center; gap: 10px; }
.fc-mydeck-delete { color: var(--color-warning-text); }
.fc-mydeck-empty { font-size: 0.9rem; color: var(--color-muted); margin: 0; }
.fc-mine-badge {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: bold;
    color: var(--color-mydeck-accent);
    background: var(--color-mydeck-accent-bg);
    border-radius: var(--radius-pill);
    padding: 2px 8px;
    vertical-align: middle;
}

/* マイデッキ編集フォーム */
.mydeck-edit-wrap { max-width: var(--article-width); margin: 0 auto; }
.mydeck-cards-head { display: flex; justify-content: space-between; align-items: baseline; margin-top: 20px; }
.mydeck-card-rows { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.mydeck-card-row { display: flex; align-items: center; gap: 8px; }
.mydeck-card-num { width: 22px; text-align: right; color: var(--color-muted); font-size: 0.85rem; flex-shrink: 0; }
.mydeck-card-row .fc-input { flex: 1; min-width: 0; }
.mydeck-row-del {
    position: relative;
    flex-shrink: 0;
    width: 30px; height: 30px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
}
/* 見た目は30pxのまま、タップ判定を44pxに広げる（アクセシビリティ） */
.mydeck-row-del::before {
    content: "";
    position: absolute;
    inset: -7px;
}
.mydeck-row-del:hover { color: var(--color-warning-text); border-color: var(--color-warning-border); }

/* スマホ: 表・裏の入力を縦積みに（横並びだと375px幅で1枠約140pxしかない）。
   番号は左・削除ボタンは右で2行ぶんの中央に配置 */
@media (max-width: 768px) {
    .mydeck-card-row {
        display: grid;
        grid-template-columns: 22px minmax(0, 1fr) 30px;
        row-gap: 6px;
    }
    .mydeck-card-num {
        grid-column: 1;
        grid-row: 1 / span 2;
    }
    .mydeck-card-row input[name="front[]"] {
        grid-column: 2;
        grid-row: 1;
    }
    .mydeck-card-row input[name="back[]"] {
        grid-column: 2;
        grid-row: 2;
    }
    .mydeck-row-del {
        grid-column: 3;
        grid-row: 1 / span 2;
    }
}

/* マイページ */
.mypage-wrap { max-width: var(--container-width); margin: 0 auto; }
.mypage-section { margin-top: 36px; }
.mypage-empty { font-size: 0.9rem; color: var(--color-muted); }
.mypage-history-list { list-style: none; margin: 0; padding: 0; }
.mypage-history-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
}
.mypage-history-item a { color: var(--color-heading); text-decoration: none; font-weight: bold; }
.mypage-history-item a:hover { text-decoration: underline; }
.mypage-history-date { font-size: 0.82rem; color: var(--color-muted); white-space: nowrap; flex-shrink: 0; }
.mypage-table-wrap { overflow-x: auto; }
.mypage-results-table { width: 100%; border-collapse: collapse; }
.mypage-results-table th, .mypage-results-table td {
    text-align: left; padding: 9px 12px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.88rem; white-space: nowrap;
}
.mypage-results-table th { color: var(--color-muted); background: var(--color-label-bg); }

/* お問い合わせフォーム */
.contact-form-card { max-width: var(--article-width); margin: 28px auto 0; }

/* ============================================================
   お問い合わせ（サイト内スレッド）
   ============================================================ */

.contact-retention-note {
    font-size: 0.82rem;
    color: var(--color-muted);
    margin: 8px 0 0;
    line-height: 1.6;
}

/* スレッド一覧（ユーザーの /contact 内） */
.contact-thread-list { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.contact-thread-item > a {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-heading);
    background: var(--color-surface);
}
.contact-thread-item > a:hover { border-color: var(--color-border-soft); background: var(--color-label-bg); }
.contact-thread-item.is-unread > a { border-left: 3px solid var(--color-notice-text); }
.contact-thread-subject { font-weight: bold; }
.contact-thread-meta { display: flex; align-items: baseline; gap: 10px; font-size: 0.82rem; color: var(--color-muted); }
.contact-unread-dot { color: var(--color-notice-text); font-size: 0.7rem; vertical-align: middle; margin-left: 4px; }

/* 会話バブル */
.contact-thread-wrap { max-width: var(--article-width); }
.contact-conversation { display: flex; flex-direction: column; gap: 14px; margin: 8px 0 24px; }
.contact-bubble {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.contact-bubble-head {
    font-size: 0.78rem;
    font-weight: bold;
    color: var(--color-muted);
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
    gap: 12px;
}
.contact-bubble-date { font-weight: normal; }
.contact-bubble-body { white-space: pre-wrap; line-height: 1.75; color: var(--color-text); }
/* ユーザー発言：右寄せ・淡色 */
.contact-bubble--user { align-self: flex-end; background: var(--color-label-bg); border: 1px solid var(--color-border); }
/* 運営返信：左寄せ・アクセント */
.contact-bubble--admin { align-self: flex-start; background: #eef5ff; border: 1px solid #cfe0f5; }

.contact-reply-card { margin-top: 8px; }

@media (max-width: 768px) {
    .contact-bubble { max-width: 100%; }
}

/* サイト内通知バッジ（ナビ）＋マイページの通知バナー */
.nav-badge {
    display: inline-block;
    min-width: 17px;
    height: 17px;
    padding: 0 5px;
    margin-left: 4px;
    font-size: 0.68rem;
    font-weight: bold;
    line-height: 17px;
    text-align: center;
    color: #fff;
    background: var(--color-alert);
    border-radius: var(--radius-pill);
    vertical-align: middle;
}
.mypage-notice {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
    padding: 12px 16px;
    background: var(--color-notice-bg);
    border: 1px solid var(--color-notice-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-heading);
    font-size: 0.92rem;
}
.mypage-notice:hover { background: var(--color-notice-bg-strong); }

/* コラムの閲覧ロックボックス（ログイン限定・有料準備中） */
.column-lock-box {
    margin-top: 24px;
    text-align: center;
}
.column-lock-box h2 { margin-top: 0; }
.column-lock-box .form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}
/* ロックボックスは .article-body 内に描画されるため、.article-body a（濃色＋下線）が
   ボタンの文字色・下線を上書きしてしまう（主ボタンが濃色背景に濃色文字で読めなくなる）。
   ボタンとしての見た目をここで復元する。 */
.column-lock-box .primary-button { color: #ffffff; }
.column-lock-box .primary-button,
.column-lock-box .secondary-button { text-decoration: none; }

/* 許可者に見せる会員限定エリアは装飾なしの素の本文として表示するため、
   専用の囲みスタイル（旧 .access-area）は持たない。 */

/* ─── ローディング表示（グローバル進行バー・スピナー・待機状態） ─── */

/* 画面上端の不確定プログレスバー。z-index はナビドロワー(1002)より上の 1100。 */
#loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 1100;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}
#loading-bar.is-active { opacity: 1; }
#loading-bar::before {
    content: "";
    display: block;
    height: 100%;
    width: 40%;
    background: linear-gradient(90deg, var(--color-loading), #4da3ff);
    border-radius: 0 2px 2px 0;
    transform: translateX(-100%);
}
#loading-bar.is-active::before {
    animation: loading-bar-slide 1.2s ease-in-out infinite;
}
@keyframes loading-bar-slide {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(250%); }
}

/* 汎用スピナー。使い方: <span class="loading-spinner" aria-hidden="true"></span> */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-loading);
    border-radius: 50%;
    animation: loading-spin 0.8s linear infinite;
    flex: 0 0 auto;
}
.loading-spinner--lg { width: 32px; height: 32px; }
@keyframes loading-spin { to { transform: rotate(360deg); } }

/* スピナー＋文言の標準レイアウト */
.loading-inline {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 24px 12px;
    color: var(--color-muted);
    font-size: 0.9rem;
}
/* hidden 属性は UA スタイルなので、上の display:flex（author スタイル）に
   負けて効かない。同じ .loading-inline 起点で明示的に上書きする。 */
.loading-inline[hidden] { display: none; }

/* 送信中ボタン（data-loading-submit 付きフォームの送信ボタンに loading.js が自動付与する）*/
.is-busy {
    opacity: 0.6;
    pointer-events: none;
    cursor: default;
}

/* スケルトン（シマー付きプレースホルダ） */
.loading-skeleton {
    position: relative;
    overflow: hidden;
    background: var(--color-surface-alt);
}
.loading-skeleton::after {
    content: "";
    position: absolute;
    inset: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.7), transparent);
    animation: loading-shimmer 1.4s ease infinite;
}
@keyframes loading-shimmer { to { transform: translateX(100%); } }

/* 動きを減らす設定への配慮 */
@media (prefers-reduced-motion: reduce) {
    #loading-bar.is-active::before { animation: none; width: 100%; opacity: 0.5; transform: none; }
    .loading-skeleton::after { animation: none; }
    .loading-spinner { animation-duration: 1.6s; }
}

/* ─── W&B 個人設定（マイ機体パネル・体重チップ・プロファイル/機体エディタ） ─── */

/* 計算画面のマイ機体パネル（fc-mydecks-panel と同トーン） */
.wb-my-aircraft-panel {
    background: var(--color-label-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    margin-bottom: 24px;
}
.wb-panel-head {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.wb-panel-title { font-size: 1.05rem; color: var(--color-heading); }
.wb-panel-new { padding: 8px 14px; font-size: 0.9rem; }
.wb-panel-limit { font-size: 0.85rem; color: var(--color-muted); }
.wb-panel-people { margin-left: auto; font-size: 0.85rem; color: var(--color-heading); text-decoration: none; }
.wb-panel-people:hover { text-decoration: underline; }
.wb-panel-empty { font-size: 0.9rem; color: var(--color-muted); margin: 0; }
.wb-aircraft-btns { display: flex; flex-direction: column; gap: 8px; }
.wb-aircraft-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 8px 12px;
}
.wb-aircraft-load {
    flex: 1;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.95rem;
    color: var(--color-heading);
    padding: 4px 2px;
}
.wb-aircraft-load:hover { color: var(--color-loading); }
.wb-aircraft-del { color: var(--color-warning-text); }

/* 体重プリセットのチップ */
.wb-people-chips {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 14px;
}
.wb-people-label { font-size: 0.82rem; color: var(--color-muted); }
.wb-people-manage { font-size: 0.8rem; color: var(--color-heading); text-decoration: none; }
.wb-people-manage:hover { text-decoration: underline; }
.wb-chip {
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}
.wb-chip:hover { background: var(--color-button-secondary); border-color: var(--color-loading); }
.wb-chip-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }

/* プロファイルモード（計算画面） */
.wb-profile-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}
.wb-profile-name { font-size: 1.2rem; margin: 0; color: var(--color-heading); }

/* 入力欄＋単位サフィックス（入力欄の端に単位を表示） */
.input-unit { display: flex; align-items: stretch; }
.input-unit > input { flex: 1; min-width: 0; border-top-right-radius: 0; border-bottom-right-radius: 0; }
.input-unit > .field-unit {
    display: inline-flex; align-items: center; padding: 0 10px;
    font-size: 0.82rem; color: var(--color-muted);
    background: var(--color-label-bg);
    border: 1px solid var(--color-input-border); border-left: none;
    border-top-right-radius: var(--radius-sm); border-bottom-right-radius: var(--radius-sm);
    white-space: nowrap;
}
.input-unit > .field-unit-select {
    border-left: none; border-top-left-radius: 0; border-bottom-left-radius: 0;
    flex: 0 0 auto; width: auto;
}
.wb-field-note { font-size: 0.75rem; font-weight: normal; color: var(--color-muted); }

/* 機体エディタ */
.wb-edit-wrap { max-width: var(--article-width); margin: 0 auto; }
.wb-edit-section {
    margin-top: 28px;
    padding-top: 4px;
}
.wb-edit-h2 { font-size: 1.05rem; margin: 0 0 6px; color: var(--color-heading); }
.wb-edit-note { font-size: 0.85rem; color: var(--color-muted); margin: 6px 0 10px; }
.wb-edit-hint { font-size: 0.78rem; color: var(--color-muted); margin: 6px 0 0; }
.wb-rows { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.wb-rows-head {
    display: grid;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--color-muted);
    padding: 0 40px 4px 2px;
}
.wb-row { display: grid; align-items: center; gap: 8px; }
.wb-row .fc-input { min-width: 0; }
.wb-station-head, .wb-station-row { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr) 30px; }
.wb-env-head, .wb-env-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) 30px; }
.wb-person-head, .wb-person-row { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) 90px 30px; }
.wb-fluid-head, .wb-fluid-row { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) 84px 68px minmax(0, 0.9fr) 30px; }
.wb-fluid-row .wb-fluid-density:disabled { background: var(--color-label-bg); opacity: 0.6; }

/* 公式プリセット機体グループ */
.wb-official-group { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--color-border); }
.wb-official-title { font-size: 0.85rem; color: var(--color-muted); margin: 0 0 8px; }
.wb-official-badge {
    font-size: 0.68rem; font-weight: bold; color: var(--color-mydeck-accent);
    background: var(--color-mydeck-accent-bg); border-radius: var(--radius-pill);
    padding: 2px 8px;
}
/* ロック中の公式プリセット（運営が手動で解錠するまで読み込み不可） */
.wb-aircraft-load.is-locked { color: var(--color-muted); font-weight: 600; }
.wb-aircraft-load.is-locked:hover { color: var(--color-heading); }
.wb-official-item-locked .wb-official-badge,
.wb-aircraft-load.is-locked ~ .wb-official-badge {
    color: var(--color-warning-text); background: var(--color-warning-bg);
}
.wb-locked-notice {
    margin-top: 10px; font-size: 0.85rem; line-height: 1.6;
    color: var(--color-warning-text); background: var(--color-warning-bg);
    border: 1px solid var(--color-warning-border); border-radius: var(--radius-md);
    padding: 10px 12px;
}
.wb-locked-notice a { color: inherit; text-decoration: underline; font-weight: bold; }
.wb-locked-notice[hidden] { display: none; }

/* CGエンベロープの離着陸切替 */
.wb-env-toggle { display: flex; align-items: center; gap: 8px; margin-top: 16px; font-size: 0.9rem; color: var(--color-text); cursor: pointer; }
.wb-env-toggle input { width: auto; }

@media (max-width: 768px) {
    .wb-rows-head { display: none; }
    .wb-station-row, .wb-env-row, .wb-person-row {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 30px;
    }
    .wb-station-row input[name="station_name[]"],
    .wb-env-row .input-unit:first-child,
    .wb-person-row input[name="person_name[]"] {
        grid-column: 1 / span 2;
    }
    .wb-station-row .mydeck-row-del,
    .wb-env-row .mydeck-row-del,
    .wb-person-row .mydeck-row-del {
        grid-row: 1 / span 2;
        grid-column: 3;
        align-self: center;
    }
    .wb-fluid-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 30px; }
    .wb-fluid-row input[name="fluid_name[]"] { grid-column: 1 / span 2; }
    .wb-fluid-row .mydeck-row-del { grid-row: 1 / span 3; grid-column: 3; align-self: center; }
}

/* ツール一覧: クローズドベータ案内ポップアップ（表示制御は tools_beta_notice.js が .visible を付与） */
#tool-beta-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
#tool-beta-overlay.visible { display: flex; }
#tool-beta-notice {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px 24px 22px;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-md);
}
#tool-beta-icon { font-size: 36px; line-height: 1; margin-bottom: 10px; }
#tool-beta-title { font-size: 18px; font-weight: 700; color: var(--color-heading); margin: 0 0 12px; }
#tool-beta-body { font-size: 13px; color: var(--color-muted); line-height: 1.7; margin: 0 0 22px; }
#tool-beta-body a { color: var(--color-notice-text); font-weight: 700; text-decoration: underline; }
#tool-beta-actions { display: flex; flex-direction: column; gap: 10px; }
#tool-beta-close {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    background: var(--color-heading);
    border: none;
    border-radius: var(--radius-md);
    padding: 11px 16px;
    cursor: pointer;
    transition: opacity 0.15s;
}
#tool-beta-close:hover { opacity: 0.88; }